Browser add-ons can enhance user experience or provide extra functionalities. Use this tag if your question is about a browser add-on, e.g. Tampermonkey

Browser add-ons can enhance user experience or provide extra functionalities. This is a popular feature of browsers on desktop machines. However, on Android, only a few browsers support add-ons, for example Mozilla Firefox and Opera. The ability to install add-ons or extensions is notably absent in mobile Chrome.